/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.runtime.state.ttl.mock;

import org.apache.flink.api.common.JobID;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.core.fs.CloseableRegistry;
import org.apache.flink.metrics.MetricGroup;
import org.apache.flink.runtime.execution.Environment;
import org.apache.flink.runtime.jobgraph.JobVertexID;
import org.apache.flink.runtime.query.KvStateRegistry;
import org.apache.flink.runtime.query.TaskKvStateRegistry;
import org.apache.flink.runtime.state.AbstractKeyedStateBackend;
import org.apache.flink.runtime.state.AbstractStateBackend;
import org.apache.flink.runtime.state.CheckpointMetadataOutputStream;
import org.apache.flink.runtime.state.CheckpointStorage;
import org.apache.flink.runtime.state.CheckpointStorageLocation;
import org.apache.flink.runtime.state.CheckpointStorageLocationReference;
import org.apache.flink.runtime.state.CheckpointStreamFactory;
import org.apache.flink.runtime.state.CheckpointedStateScope;
import org.apache.flink.runtime.state.CompletedCheckpointStorageLocation;
import org.apache.flink.runtime.state.KeyGroupRange;
import org.apache.flink.runtime.state.KeyedStateHandle;
import org.apache.flink.runtime.state.OperatorStateBackend;
import org.apache.flink.runtime.state.OperatorStateHandle;
import org.apache.flink.runtime.state.ttl.TtlTimeProvider;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import java.util.Collection;

/** mack state backend. */
public class MockStateBackend extends AbstractStateBackend {
	private static final long serialVersionUID = 995676510267499393L;

	@Override
	public CompletedCheckpointStorageLocation resolveCheckpoint(String externalPointer) {
		throw new UnsupportedOperationException();
	}

	@Override
	public CheckpointStorage createCheckpointStorage(JobID jobId) {
		return new CheckpointStorage() {
			@Override
			public boolean supportsHighlyAvailableStorage() {
				return false;
			}

			@Override
			public boolean hasDefaultSavepointLocation() {
				return false;
			}

			@Override
			public CompletedCheckpointStorageLocation resolveCheckpoint(String externalPointer) {
				return null;
			}

			@Override
			public void initializeBaseLocations() {

			}

			@Override
			public CheckpointStorageLocation initializeLocationForCheckpoint(long checkpointId) {
				return new CheckpointStorageLocation() {

					@Override
					public CheckpointStateOutputStream createCheckpointStateOutputStream(CheckpointedStateScope scope) {
						return null;
					}

					@Override
					public CheckpointMetadataOutputStream createMetadataOutputStream() {
						return null;
					}

					@Override
					public void disposeOnFailure() {

					}

					@Override
					public CheckpointStorageLocationReference getLocationReference() {
						return null;
					}
				};
			}

			@Override
			public CheckpointStorageLocation initializeLocationForSavepoint(long checkpointId, @Nullable String externalLocationPointer) {
				return null;
			}

			@Override
			public CheckpointStreamFactory resolveCheckpointStorageLocation(long checkpointId, CheckpointStorageLocationReference reference) {
				return null;
			}

			@Override
			public CheckpointStreamFactory.CheckpointStateOutputStream createTaskOwnedStateStream() {
				return null;
			}
		};
	}

	@Override
	public <K> AbstractKeyedStateBackend<K> createKeyedStateBackend(
		Environment env,
		JobID jobID,
		String operatorIdentifier,
		TypeSerializer<K> keySerializer,
		int numberOfKeyGroups,
		KeyGroupRange keyGroupRange,
		TaskKvStateRegistry kvStateRegistry,
		TtlTimeProvider ttlTimeProvider,
		MetricGroup metricGroup,
		@Nonnull Collection<KeyedStateHandle> stateHandles,
		CloseableRegistry cancelStreamRegistry) {
		return new MockKeyedStateBackendBuilder<>(
			new KvStateRegistry().createTaskRegistry(jobID, new JobVertexID()),
			keySerializer,
			env.getUserClassLoader(),
			numberOfKeyGroups,
			keyGroupRange,
			env.getExecutionConfig(),
			ttlTimeProvider,
			stateHandles,
			AbstractStateBackend.getCompressionDecorator(env.getExecutionConfig()),
			cancelStreamRegistry).build();
	}

	@Override
	public OperatorStateBackend createOperatorStateBackend(
		Environment env,
		String operatorIdentifier,
		@Nonnull Collection<OperatorStateHandle> stateHandles,
		CloseableRegistry cancelStreamRegistry) {
		throw new UnsupportedOperationException();
	}
}
